Dense clouds at the south rim of the Grand Canyon in Arizona, Dec. 11, 2014.

The total cloud inversion is expected to hang over the Grand Canyon just below the rim throughout the day.

Visitors to Mather Point on the South Rim of Grand Canyon National Park, Ariz., view a rare weather phenomenon - a sea of thick clouds filling the canyon just below the rim, Dec. 11, 2014.

Cory Mottice of the National Weather Service said the weather event usually happens once every several years, though the landmark was treated to one last year.

In the past few days, the sweeping vistas of the Grand Canyon have been replaced by an equally stunning view, Nov. 29, 2103.

Due to a rare weather phenomenon, the canyon was filled with fog, giving onlookers the illusion that they were high above the clouds.

The National Weather Service has posted a breathtaking series of images of this weather event, called a temperature inversion.

Temperature inversions usually happen in winter, when longer nights cause cool air to become trapped beneath warmer air, Nov. 29, 2103.

The fog-filled canyon as seen from Mather Point, Nov. 29, 2013.

A view of the Grand Canyon filled with fog due to a temperature inversion, Nov. 29. 2013.

A view of the Grand Canyon filled with fog due to a temperature inversion, Nov. 29, 2013.

A view of the Grand Canyon filled with fog due to a temperature inversion, Nov. 29, 2013.

Clouds all the way to the horizon in the Grand Canyon, Nov. 29, 2013.

A view of the canyon's South Rim, covered in fog, Nov. 29, 2013.

A view of the Grand Canyon filled with fog due to a temperature inversion, Nov. 29, 2013.

A vertical panorama of frosted plants, with the foggy canyon in the background, 2013.

A view of the Grand Canyon filled with fog due to a temperature inversion,  2013.

A view of the Grand Canyon filled with fog due to a temperature inversion, Nov. 29, 2013.

A view of  the fog-filled canyon from Mather Point. NPS photographer Erin Whittaker wrote, "Rangers wait for years to see it. Word spread like wildfire and most ran to the rim to photograph it. What a fantastic treat for all! ", Nov. 29. 2013.

A view of the Grand Canyon filled with fog due to a temperature inversion,  2013.

A view of the Grand Canyon filled with fog due to a temperature inversion, Nov. 29, 2013.

A view of the Grand Canyon filled with fog due to a temperature inversion, taken just after 8 a.m, Nov. 29, 2013.

A view of the Grand Canyon filled with fog due to a temperature inversion, Nov. 29, 2013.

NPS photographer Erin Whittaker wrote, "The canyon gave us a second rare inversion in three days. Freezing fog dominated yesterday and is reflected in great patterns on this Kaibab Limestone. By the end of the day the sun was able to burn it all away no doubt making many first time visitors very happy.", Nov. 29, 2013.

A view of the Grand Canyon filled with fog due to a temperature inversion, Nov. 29, 2013.

The North Rim's Grand Canyon Lodge above the clouds, Nov. 29, 2013.